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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9f9565ec62ba93cbe9fd05cdd64b9638ecd27241e9a72c1f035312645cd8e84' 
  AND token = '1hiX3ff9X6NXUDQi9W1Pbz5mJDmcWQ7LsnKhDRrsZwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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