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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec5b01eef353b1e6f6701998791e1846b981eb5d0c183572003a139834a477a6' 
  AND token = 'e8EeBhITSy35Jb/9QCChuB/09SVBfs/nwbAUC994iT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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