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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71ea8ed72164003c5df532ac65f7819808a7903853891c8297417e67cf7fb5f9' 
  AND token = 'A5oFrOB3tNtRtxlWCYiA2jarXSW72Xr28VCCWNrMcPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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