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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a55ea152455807e8e8f6fc9e93adfb5e56fcbf784c4254a2e1c9b598154bc4bd' 
  AND token = '8pE1WEp4J/p+NZUwUgfAybJ5gIF3kRnItjHuVk6aH3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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