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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee88cd62ff695c795ab086c2ca97b83258db47cae25e16b8c7d1fd7b61eb0eeb' 
  AND token = 'b/k7WSUiIN3YqiUWJVrfqrxDqyyACBjgqMugkNo6u/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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