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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3487308fc6eea64113209c87207015f5fbbc71369a5af0f5ac4043d335165f7e' 
  AND token = 'dI4WnSb/fY4A7OBthWlO/bjtANdwrm4YHYLTw8vSSpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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