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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f76a466c9b368486fb04180d24faf3241f591ba283078f75f902b9d52e424cee' 
  AND token = 'Hi6sSg6skGrDon9/dFiKdpTNy+QE5qp9ViV6E66AKYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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