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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdb424cf89161a0d35b8c2f8d1fe68782ec04574953a12db806fad0d4ce3f4e8' 
  AND token = 'TtA1uqHvLZbfhT+CpjEWi8+hKyjoynBTyHd2zaPep3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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