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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97e35191a49810b5fa5fc97d004d2c1eaea552b297b9074d4499d4929698b258' 
  AND token = 'AZjb9jto0q88eYFrP5ETp+4xSxlczyO1uyLYMz0+QeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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