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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21352f53b0250ad8816163db327c536c06651ef47bfef0f5f24654f89953d7f9' 
  AND token = 'J9LKxZI68c8XO5yAPtIw1SMp99LyEfSJo8ekqjFmniw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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