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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c93bc3a126bbd274c3c4e2ddf1f412a294b3ec06a1a4a19e81f691f299cf379' 
  AND token = 'LeySdnkNVc7Wn3vnNHFMeBgplI1GK7/7C3Pa7TRsV/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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