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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0efe068122049aac289917c5187e7949c104db7a01f36c37186a627dd2a0c033' 
  AND token = 'bRwo8eMBLc8fcOvSgn3KyCGQ8dtIqnQ15HWwshjoWcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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