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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6abdace77a13fd9f4afc62c9630ab8f804cb0c5b44ec4800fe84372f9382e4a4' 
  AND token = '+gUbGH+QROpgkyQr7DMLWSFRoMQdsfub2fVgJrMfmIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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