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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72557a958b2762d87edcd1fe19645cd1c9ffcc880f07ce07efb07d7f92e275c1' 
  AND token = 'FqRDZHUcf0XVIPubuGVkrmiTvVFZcd+yrjjOGHxXWbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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