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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac386f401d8ded7ce43c5e9913aa1e83d5470a05bba8c4a48b6a4bfd9dca2f4a' 
  AND token = '9+/NAjNtB8B7xiZg8PUo9J+AAtrdTE3rs5zq1Zqfxtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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