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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb40295a02c9cb8fdd520ffe91efd3f47aa046987068bd025d90fa6d715aaef4' 
  AND token = 'H13oLkVr3FFtNkq6WHvgDlAUOLvXwHGRMZVXioZ0Dq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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