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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db022231f97d5d9d7732487b9bbad3942a0d8ada895457629639191d3348247c' 
  AND token = 'o/8OS1O36AONMt3PRlI/FSReMOzTtzQPYsgCwryp8t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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