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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25dfa3843f66ef3c3a7f48a0d152a51cbb0eeea499cd867be5cb0c7c394550ac' 
  AND token = '0sffamQWUQfU6bsQzKQBfuzIq+7AvaLIMDzxLA0+2oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}