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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd336d0f36c2ad36cfd3d914dc66da8d678f0a07da102f72e2d6dea12b047dce0' 
  AND token = 'GmIMgTQQp4t/JosG5ihxMCseJC30HWlSc6eobynZQxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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