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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a63d344f0f4e9525716b4071649242d367d2262b7cea9d738b64f65869f92e9' 
  AND token = '0MwrtetuS4Asdzo/XFQzNsLffe3+mgg2iwdeFkVhxcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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