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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a04b5e9c6085b6f04f010a41e6feb2273b98b80adbf1df489e3f2ab6a83650ee' 
  AND token = 'aQAHPrTxnPFoJipg+lL5odNOfTpKBG4jwJSGMmIW9ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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