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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b030d3c3771a5a267897f1f896daa1db14abc780d209a6623a2e0bf1cad542f4' 
  AND token = 'TRxnYn4N5k6oiRizKCcN2adUbk4SXELbB/5c/ZlZ7Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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