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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0eb1b60c0d9a6ee2ff05ee596bf48c8a0a5c4b4d3ffbb5eff605f3d92b914eb2' 
  AND token = '4hBdGBYxAbyOkz72Ayg+w7Dej++93jtlhLbeNDLiRIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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