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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea9300fa0a5f9ca99eb7fe88fb36d0cba47e7c6ae888506f1a28a22bd35add75' 
  AND token = '4UNghadW9C4A1mglsJkn/fEogDr9xZEGCnHxsl+85Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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