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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4799573865498cab3a3455677d164581daf8e7a0421ac4f7917ebbeba018a8c4' 
  AND token = 'PRRnaSq/8ahpZ+vb+Xt4Dmm+Nm2l6uhm1Hupilnm8o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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