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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a14d872c0f08773dab3ddf9931af605d5a626b42a7894efa21a377db17bc75bd' 
  AND token = 'ltel55nAOaL0w7F12b4YVB/vHojSrCEGirYdLZ9ggn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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