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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66c954432243eb01ec801721690ea20656669ebcde265f1ef7be68fb825d6f29' 
  AND token = 'wSMNPlad9B/lDL2qxZ9xWvi0XArt3Pi+/xsyc6EQBVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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