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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da6c9bf521ead289e5858dc6c07887d67e293f1381144a0682e23208c0c2e41f' 
  AND token = 'G7g5x1QSrVbL5CGUOacpolOZG+xyjxZosM97VJRXprU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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