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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9eb1f7f30ff66225a49875d2b6310474a65547aa02d6d0abe8c4b8125e97dc12' 
  AND token = '1SHMsG6i23PMtJSHRaZZPB3y66hWLo4ieXBogo+HJ5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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