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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13d48db59b8f515aec1b750e789a307c232a208eab31323a09dc3745f1b61300' 
  AND token = 'IJvPbViW39byclSn1i8ORkSDrsutyOze7XMD0sSj4kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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