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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31604c8e2d940dbc141a351f99ed64c090a9a58b801c844b0c38b0e9ebd81ec1' 
  AND token = 'JxYKJHAfj6J0XNxrj+JoFO6/kW7ZFfrijnOK+rpqUrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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