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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40e94b7cf9c110ecdc75f7162809128c3a7b975e61433baea88295bc07f113f8' 
  AND token = 'r/5ypa+bs8LPuglH+W44BT9/ccazXvpjuvhxESXpHQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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