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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '963565f925f13dd50c99532c1c808ea5030382a6befc2439ab9d8672ded4f4e0' 
  AND token = 'MpIvHz0scEfNqbGotOGotvbS0U23iu3BrlBZbHfGryg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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