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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5748495e9ad4c8d35599d4fa5647c8ca15279f9190cbd6ecaef62dd64a21e52' 
  AND token = 'yk4D+eikr2esyPYYPoUS+WTbvM58Akk1eHnALF+gb8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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