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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbc6ce6def9e3f572a8d39641a52d2c1b47b9ff314a5686ac7561662c2f67410' 
  AND token = 'ff1gScpwnv4ebkJTUr3NrDrQimwIWhObyTcmPeCPu/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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