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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebc5460c3cd3caf5b58c773f98c7ca89c223b2d50a74efa3ca4439a6972c7fb8' 
  AND token = 'kHAEnB3mz2TX+7BorS7EukdJQtej4Hv/r3i2Pv7qY9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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