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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8c8a4c2c761d36f51e041e6fadc233fd60da77ba06a5291bb07166ad7e609c0' 
  AND token = 'XCYdNgzsFomAyOACpR0HJj0Qs0g+Q1ujkF+ZfYYQgl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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