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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13d332c79009ac406ea414d94a165bd43f888fe34c7b4d5ebf29e7a1a20ed63a' 
  AND token = 'KNn/S4sfptd1vJ+div4xJgEGFa00aZClAbs9zOY2ZhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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