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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b20b18522d50d650990484e0c8ce30828c15bd5f069de25878403fba5d338c27' 
  AND token = 'A7VSfuIO+SpufpvpFHoc7UosPO8/maFkVWHWxWpFMFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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