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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7d4f35093fc0aa5cd433171ce23bc0f2edd0281e6b76ee0878306dc8793e398' 
  AND token = '9dzc/VnVwfZf0SfM1jahQu2xTcMc9zsa/NUCUJRT4AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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