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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f40b4436612923b0c43a89aa99876029c34ebc6e55e6544d496c0ccdaad17bd5' 
  AND token = 'ZAzTF2YDeJcpSDLazkci787ycyx5rCt1/pPe/Kbeuo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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