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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5619c7ec4e6c785ea0d944ab9f3ce9fe61d2c2400c21f9c6908721df10565b03' 
  AND token = 'd0JcD5vSOK6Ds0oV6CCf0VvMDIQ9zVYN8gXmbUiHjKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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