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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5387468a9605bc78228054311534d10c966e6febe75009f1d959a6dd4e83bf63' 
  AND token = '9yhKKZ9i/0X14DI/CaZD2elpRXIGSqO4rv8DIIeupc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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