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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa380992c4b99daa542c1778b39189ae8fa601c95ce5779792491e97f4673cef' 
  AND token = '5AEg5n8DWMnZL0jawH+2MFDg6l68cvZAIbONJvrfQqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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