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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f7b5a02be822549d696ccbf8c0359024636f3ea2dfe03ba9836e05fac9f64f7' 
  AND token = 'Xi4+UsDbrbb4WK+OaEOXMBEtJLPOQ4YZiVtuiNZgS2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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