SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a87da517d02f3f64607894ed50932d7ebf0f565cc293d0ffe0a737cde9680e61' 
  AND token = '0+KYEToAuFG/Xo8h0swWl1mZfEVzWvWKNtGjmB0wYTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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